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Mount Prospect, Illinois 7 Day Weather Forecast
Wx Forecast - Wx Discussion - Wx Aviation
NWS Forecast for Mount Prospect IL
National Weather Service Forecast for: Mount Prospect IL
Issued by: National Weather Service Chicago, IL
Updated: 3:56 am CDT Jun 29, 2026
 
Today

Today: Sunny, with a high near 94. Heat index values as high as 103. South southwest wind around 15 mph, with gusts as high as 25 mph.
Sunny

Tonight

Tonight: Mostly clear, with a low around 78. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Mostly Clear

Tuesday

Tuesday: Partly sunny, then gradually becoming sunny and hot, with a high near 96. Heat index values as high as 106. Southwest wind around 15 mph, with gusts as high as 25 mph.
Hot

Tuesday
Night
Tuesday Night: Mostly clear, with a low around 78. Southwest wind 10 to 15 mph, with gusts as high as 30 mph.
Mostly Clear

Wednesday

Wednesday: Sunny and hot, with a high near 96. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Hot

Wednesday
Night
Wednesday Night: Mostly clear, with a low around 78.
Mostly Clear

Thursday

Thursday: Sunny and hot, with a high near 96.
Hot

Thursday
Night
Thursday Night: A chance of showers and thunderstorms.  Partly cloudy, with a low around 77.
Chance
T-storms

Friday

Friday: A chance of showers, with thunderstorms also possible after 1pm.  Partly sunny, with a high near 91.
Chance
Showers then
Chance
T-storms
Hi 94 °F Lo 78 °F Hi 96 °F Lo 78 °F Hi 96 °F Lo 78 °F Hi 96 °F Lo 77 °F Hi 91 °F

Extreme Heat Warning
Hazardous Weather Outlook
 

Today
 
Sunny, with a high near 94. Heat index values as high as 103. South southwest wind around 15 mph, with gusts as high as 25 mph.
Tonight
 
Mostly clear, with a low around 78. South southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Tuesday
 
Partly sunny, then gradually becoming sunny and hot, with a high near 96. Heat index values as high as 106. Southwest wind around 15 mph, with gusts as high as 25 mph.
Tuesday Night
 
Mostly clear, with a low around 78. Southwest wind 10 to 15 mph, with gusts as high as 30 mph.
Wednesday
 
Sunny and hot, with a high near 96. Southwest wind 10 to 15 mph, with gusts as high as 25 mph.
Wednesday Night
 
Mostly clear, with a low around 78.
Thursday
 
Sunny and hot, with a high near 96.
Thursday Night
 
A chance of showers and thunderstorms. Partly cloudy, with a low around 77.
Friday
 
A chance of showers, with thunderstorms also possible after 1pm. Partly sunny, with a high near 91.
Friday Night
 
A chance of showers and thunderstorms. Partly cloudy, with a low around 73.
Independence Day
 
Mostly sunny, with a high near 88.
Saturday Night
 
A chance of showers and thunderstorms. Partly cloudy, with a low around 71.
Sunday
 
A chance of showers and thunderstorms. Partly sunny, with a high near 86.

 

Forecast from NOAA-NWS for Mount Prospect IL.

Weather Forecast Discussion
301
FXUS63 KLOT 291121
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
621 AM CDT Mon Jun 29 2026

.KEY MESSAGES...

- Dangerous heat is expected across the area this week with
  afternoon heat index values forecasted over 100 degrees.
  Little to no relief is expected at the lakeshore or at night.

- A return to a more active pattern and thunderstorm chances is
  likely by the weekend.

&&

.DISCUSSION...
Issued at 159 AM CDT Mon Jun 29 2026

No changes made to ongoing heat headlines, with an Extreme Heat
Warning for Cook County and a Heat Advisory for all other
counties running from noon today through 10 PM CDT Wednesday
evening.

Evening upper air analysis depicts an unseasonably deep long-
wave upper trough and embedded closed low over the western
CONUS, and downstream upper ridging from the lower Mississippi
Valley into the Midwest. At the surface, deep low pressure
around 996 mb was over northeast Colorado, with a warm front
arcing into northwest IA and then southeast along roughly a
KMLI-KCMI-KHUF line across central Illinois and southwest
Indiana as of midnight. This warm front is expected to lift
north across the WFO LOT forecast area this morning, as the
low develops north-northeastward across the Plains in response
to a strong mid-level short wave rounding the base of the
aforementioned upper low in the west.

Meanwhile, the upper ridge is progged to build north-northeast
into the Ohio Valley today through Wednesday, strengthening to
nearly 6000 meters. Model 850 mb temperatures of +20/22C today
and +23/25C across the forecast area Tuesday and Wednesday will
support unseasonably warm surface temperatures in the lower and
middle 90s (perhaps a few upper 90s in spots), as well as
relatively strong capping with 700 mb temperatures +12C or
higher. Despite the strength of this capping inversion, breezy
southwest low-level flow and dry air aloft is likely to aid in
mixing out dew points during the warmest parts of each day, with
guidance generally indicating mid-70s afternoon Td values
(slightly lower across the urbanized Chicago metro area).
Forecast peak heat indices therefore remain around 105 or just a
bit higher for the most part.

With the relatively warm mid-level temperatures and associated
capping, the main axis of thunderstorm potential today through
Wednesday is expected to remain northwest of the forecast area
across parts of IA/MN and WI. Some guidance does indicate that
convective complexes will occur to our northwest both tonight
and Tuesday night, which could push decaying convection, or more
likely, associated outflow boundaries into northern IL during
the early parts of both Tuesday and Wednesday. While these
outflows could potentially impact heat indices and would need to
be monitored, the breezy southwest flow across the region would
most likely mix out the effects on surface temps/dew points
during the day.

By Thursday and Friday, the center of the upper ridge is
forecast to shift slightly southeast across Kentucky and
Tennessee, flattening across the upper Midwest and Great Lakes
regions as the western CONUS upper low lifts out across Ontario.
Cooler mid-level temps result in weaker capping across the
upper Midwest, and increase the likelihood of thunderstorm
complexes (or their remains) working into the forecast area at
times. While still warm and muggy even into next weekend, peak
daytime heat indices are forecast more in the 90s to around 100
degree range even without accounting for direct impacts of
storms or convective outflows. Thus the timing of current heat
headlines, which run through Wednesday evening, continues to
look very reasonable. In fact, over the weekend, current
guidance and ensembles eventually flatten/break down the ridge
over the southeastern U.S., and indicate a return to a
potentially more active (storm-wise), zonal jet pattern.

Ratzer

&&

.AVIATION /12Z TAFS THROUGH 18Z TUESDAY/...
Issued at 621 AM CDT Mon Jun 29 2026

Though MVFR conditions are favored through the period, the
combination of low-level moisture advecting northward and onset
of daytime heating is allowing patches of high-end IFR to low-
end MVFR stratus to develop. Expectation is for these clouds to
quickly lift through the morning, but a couple periods of BKN
MVFR ceilings cannot be ruled out through mid-morning.

SSW/SW winds are expected through the period, with gusts to 20
knots this morning and around 25 knots this afternoon. Though
surface winds will diminish after sunset, a 40 to 45 knot low-
level jet brushing northern Illinois to the north will either
produce sporadic surface gusts to around 20 knots or lead to
LLWS. Expectation is that some gusts will persist at ORD/MDW due
to weaker near surface stability over the urban heat island.
However, have included LLWS at RFD and DPA as gusts will likely
end late this evening and overnight.

Kluber

&&

.CLIMATE...
Issued at 252 AM CDT Sun Jun 28 2026

     .Daily Records for the Upcoming Week........

Chicago (KORD)
            Record High       Record Warm Minimum
June 29       97 (1954)            80 (1931)
June 30       99 (1953)            80 (2018)
July 1       103 (1956)            78 (1931)
July 2        99 (1970)            79 (1911)
July 3       102 (1949)            78 (1911)
July 4       102 (2012)            80 (1921)


Rockford (KRFD)
            Record High       Record Warm Minimum
June 29      103 (1931)            75 (1931)
June 30      102 (1931)            76 (2018)
July 1       101 (1931)            76 (1970)
July 2        99 (1910)            74 (1970)
July 3        99 (1925)            75 (2012)
July 4       102 (2012)            77 (1977)

NWS Chicago

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...Heat Advisory from noon today to 10 PM CDT Wednesday for
     ILZ003-ILZ004-ILZ005-ILZ006-ILZ008-ILZ010-ILZ011-ILZ012-
     ILZ013-ILZ019-ILZ020-ILZ021-ILZ023-ILZ032-ILZ033-ILZ039-
     ILZ106-ILZ107-ILZ108.

     Extreme Heat Warning from noon today to 10 PM CDT Wednesday
     for ILZ103-ILZ104-ILZ105.

IN...Heat Advisory from noon CDT /1 PM EDT/ today to 10 PM CDT /11
    PM EDT/ Wednesday for INZ001-INZ002-INZ010-INZ011-INZ019.

LM...Small Craft Advisory from noon today to 10 PM CDT this evening
     for the IL nearshore waters.

&&

$$

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